根据句意及中文提示,填写正确的单词.
1.She can do it ____(独自).
2.Zhang Hua helped Mrs Sun ___（扑灭）out the fire.
3.The man ___（受伤） his legs and arms in the accident.
4.I heard someone ___（唱歌）at that time.
5.He ___（冲进） into room to save the little boy